<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<head>
<script type="text/javascript">

function boom()
{
  for(var p in document.getElementById("prefs")) {
  }
  
  for(var p in window) {
  }
}

</script>
</head>
<body onload="boom();">

<xul:preferences id="prefs" />

</body>
</html>
